Preparation and characterization of organic pigments and their fluorescence properties depending on bulk structure

doi:10.1016/j.jmst.2018.05.017

Abstract

Abstract:

Fluorescent pigments, based on the optical or electrooptical properties of dyes, are the main component in fluorescent coatings and inks. In this study, three kinds of dyes (Rhodamine B, Light Green SF Yellowish, Coumarin) with four different ratios (2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%) were employed as luminophor, and the melamine-formaldehyde (MF) resin was used as curing resin to prepare fluorescent pigments in different color. Fourier transform infrared spectroscopy and X-ray diffractometry were carried out to analyze the structure of the fluorescent pigments. Scanning electron microscopy and particle size distribution were used to present the morphology of fluorescent pigments. UV-vis and fluorescence spectrum were used to demonstrate the optical properties. It can be concluded that, coumarin pigments possessed consecutive structure in MF resin while rhodamine B might be the best for the preparation of printing inks among the three kinds of dyes from the view of particle size. The TG results presented that all the pigments showed good thermal stability, which might possess potential application in high speed printing industry.

Key words: Fluorescein, Microstructures and properties, Optical properties, Thermal properties

Jie Du, Rong Yang, Changqing Fang, Xing Zhou, Shaofei Pan, Wanqing Lei, Jian Su, Youliang Cheng, Donghong Liu. Preparation and characterization of organic pigments and their fluorescence properties depending on bulk structure[J]. J. Mater. Sci. Technol., 2018, 34(11): 2218-2224.

Figures/Tables 8

Fig. 1. FTIR spectra of samples: (a) MF resin and three dyes, (b) fluorescence pigments samples synthesized from three different dyes with different ratio.

Fig. 2. XRD curves of samples: (a) MF resin and three dyes, (b) fluorescence pigments samples synthesized from three different dyes with different ratio.

Fig. 3. Morphology of samples from SEM experiments: (a) MF resin, (b) Light Green SF Yellowish dye, (c) Coumarin dye, (d) Rhodamine B dye, (e) G2.5, (f) G3, (g) G3.5, (h) G4, (i) R2.5, (j) R3, (k) R3.5, (l) R4, (m) Y2.5, (n) Y3, (o) Y3.5, (p) Y4. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Fig. 4. Particle size and particle size distribution of the fluorescence pigments: (a) pigments from light green SF yellowish dyes, (b) pigments from rhodamine B, (c) pigments from coumarin, (d) the mean particle size of the three pigments. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Fig. 5. UV/vis absorption spectrum of the prepared pigments based on different dyes.

Fig. 6. Fluorescence emission spectra of the prepared pigments based on different dyes: (a) all samples, (b) several samples with relative weak fluorescence intensity.

Fig. 7. TGA thermograms of the prepared pigments based on different dyes.

Table 1 Main decomposition of the pigments from TG analysis.

Samples	First decomposition		Second decomposition		Third decomposition
Samples	T_a (°C)	Weight loss (wt%)	T_b (°C)	Weight loss (wt%)	T_c (°C)	Weight loss (wt%)
G2.5	148.0	31.2	368.0	20.3	412.2	32.7
G3	145.6	32.1	370.6	22.8	405.6	29.0
G3.5	134.8	30.4	378.5	18.7	418.6	38.4
G4	173.6	27.2	368.6	27.7	413.6	29.3
Y2.5	164.0	24.0	380.0	26.6	424.0	33.4
Y3	138.9	32.5	373.8	30.0	418.9	33.7
Y3.5	149.4	24.1	379.4	22.8	424.4	37.2
Y4	133.7	25.3	373.7	27.6	413.7	32.0
R2.5	143.4	31.6	383.4	23.4	413.4	29.7
R3	139.1	35.2	374.1	20.2	404.1	32.0
R3.5	143.4	28.6	378.4	23.9	418.4	29.2
R4	145.5	35.3	375.5	21.9	415.5	29.3

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